Corkscrew



FIG. 1 is a top, front, left side perspective view of a corkscrewshowing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view thereof in an alternate position; and

FIG. 7 is a perspective view thereof in an alternate position.

The ornamental design for a corkscrew, as shown and described.